Single-mode micro laser based on single echo wall mode optical microcavity and implementation method

Abstract

The invention discloses a single-mode micro-laser based on a single echo wall mode optical microcavity and an implementation method, the implementation method comprises the steps of: preparing the required single echo wall mode optical microcavity doped with rare earth ions or containing gain materials such as quantum dots, wherein the configuration of the optical microcavity comprises a microdisk cavity, an annular microcavity and a runway-shaped microcavity, wherein the materials comprise lithium niobate, silicon dioxide, silicon nitride and the like; preparing an optical fiber taper or optical waveguide which has a required size and can excite an optical microcavity high-order mode, wherein the optical fiber taper or optical waveguide comprises a ridge waveguide, a circular waveguide and the like; and coupling, integrating and packaging the optical fiber taper or the optical waveguide and the microcavity. Pump light is coupled to an optical fiber taper or an optical waveguide, a composite mode which is formed by overlapping a fundamental mode and a high-order mode of an optical microcavity and is of a polygonal structure is excited, and the composite mode has a higher quality factor than a fundamental longitudinal mode. The pump light and the laser light are enabled to resonate with the composite mode respectively to obtain low-threshold and narrow-linewidth single-mode laser.

Description

technical field [0001] The invention relates to the preparation of a single-mode micro-laser, specifically a single-mode laser based on a single whispering gallery mode optical microcavity and its preparation, which is doped with a certain concentration of rare earth ions, organic macromolecules or quantum dots through femtosecond laser etching. Crystal, silicon dioxide, silicon, III-V compound semiconductor materials, silicon nitride and other thin film materials, combined with chemical polishing technology, to obtain an optical microcavity with low loss and high Q value, and finally through the optical fiber taper or optical waveguide Coupled and integrated, a single-mode microlaser with narrow linewidth and low threshold is obtained. Background technique [0002] Integrated optical circuit aims to miniaturize and integrate optical devices and optical circuits on the substrate, reduce the size, energy consumption, and delay of the optical system, improve the stability and ...

AI Technical Summary

Problems solved by technology

For single-mode lasing, the size of the whispering gallery mode optical microcavity (hereinafter referred to as the optical microcavity) is usually required to be on the submicron scale to obtain a large free spectral range, which inevitably increases the bending radiation loss of the microcavity and reduces the Improve the quality factor of the microcavity, significantly increase the pumping threshold and laser linewidth of the microlaser

[0003] At present, in order to overcome this difficulty, the commonly used and effective method is to use the vernier effect of two coupled optical microcavities to only excite the whispering gallery mode shared by the two microcavities to obtain a single-mode excitation with low threshold and narrow linewidth. However, the method exists The preparation process is complex and difficult to prepare on a large scale

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